This lifeform is found widely in Eurasia. This lifeform is widespread in North America. This lifeform has been extinct for over 20,000 years.

T. Rex (Tyrannosaurus rex) is the largest carnivore that ever walked this planet. This gigantic meat-eating dinosaur was up to fifty feet long. Its head was about twenty feet up in the air when it walked. Its teeth were up to six to seven inches long. Its small font legs were probably useless. Some scientists have suggested that this beast actually ate the remains of dead animals and was not such a killer as popularly believed.

Two-legged Walking Dinosaurs (Sub-Order Theropoda) contain the Carnosaurs such as Tyrannus rex.

Reptile Hipped Dinosaurs (Order Saurischia) contain many of the dinosaurs with which the general public is familiar. These are usually divided into two different sub-orders. Theropoda (T. Rex) were dinosaurs that walked on two hind legs. The Sauropoda (Brontosaurus) walked on all four legs. All members of this order are extinct.

Reptiles (Class Reptilia) are an ancient group of scaled  chordates. These scales may be permanently joined, as in the  turtles, or flexible, as in the snakes. Reptiles are land-based. Their eggs are laid on land and the young are air breathing.

Backboned Animals (Phylum Chordata) are the most advanced group of animals on earth. These animals are characterized by having a spinal cord or backbone. Most members have a clearly defined brain that controls the organism through a spinal cord. Fish, amphibians, reptiles, birds, and mammals are in this phylum.

Currently, some taxonomists believe that the fish should be divided into two groups (sharks and regular fishes) and that there are some other primitive groups in the phylum such as hagfish or lampreys.

Animal Kingdom contains numerous organisms that feed on other animals or plants. Included in the animal kingdom are the lower marine invertebrates such as sponges and corals, the jointed legged animals such as insects and spiders, and the backboned animals such as fish, amphibians, reptiles, birds, and mammals.